lmerTest (version 2.0-0)

lmer: Fit Linear Mixed-Effects Models

Description

Fit a linear mixed model

Value

• An object of class "merModLmerTest"

Details

This lmer function is an overloaded function of lmer of merMod class for lme4 package with an additional slot t.pval, which gives p-values for the t test of fixed terms with Satterthwaite approximation for degees of freedom.

See Also

merModLmerTest class

Examples

library(lmerTest)

## linear mixed models
fm1 <- lmer(Reaction ~ Days + (Days|Subject), sleepstudy)
fm2 <- lmer(Reaction ~ Days + (1|Subject) + (0+Days|Subject), sleepstudy)

# anova table the same as of class merMod but with additional F statistics and  
# p-values calculated based on Satterthwaite's approximations
anova(fm1)

# anova table the same as of class merMod but with additional F statistics and  
# p-values calculated based on Kenward-Roger's approximations
anova(fm1, ddf="Kenward-Roger")

# anova table the same as of class merMod
anova(fm1, ddf="lme4")

# gives summary of merModLmerTest class. The same as of class merMod but with
# additional p-values calculated based on Satterthwate's approximations
summary(fm1)

## multiple comparisons statistics. The one from lme4 package
anova(fm1, fm2)